Praxis Works DM 1x Narrow Wide ChainringNarrow Wide tooth profile for better chain retention Forged and machined 7000 series alloy with hard black anodizing for durability Works with 1x10 11 12sp Shimano, KMC and SRAM Eagle, Flat and T type chains For Gen2 (G2) Praxis cranks (noted on crank arm) and SRAM mountain cranks; +3mm offset = 52mm chainline, 0mm offset= 55mm chainline For original Gen1 Praxis cranks;+3mm offset = 49mm chainline, DM B 0mm offset=55mm chainline Must use a clutch type